/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerMode.h
Called by the outliner when an item is selected in the tree. Used to partially synchronize selection
virtual void OnItemSelectionChanged ( FSceneOutlinerTreeItemPtr Item, [ESelectInfo::Type](API\Runtime\SlateCore\Types\ESelectInfo__Type) SelectionType, const [FSceneOutlinerItemSelection](API\Editor\SceneOutliner\FSceneOutlinerItemSelection) & Selection )